New bisphenol novolac epoxy resins for marine primer steel coating applications |
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| Authors: | Ayman M. Atta M.I. Abdou Abdel-Atif A. Elsayed Mohamed E. Ragab |
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| Affiliation: | aEgyptian Petroleum Research Institute, Nasr City, 11727 Cairo, Egypt;bAlazhar University, Faculty of Engineering, Petroleum Department, Cairo, Egypt;cTown Gas Company, Cairo, Egypt |
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| Abstract: | Bisphenol derived from reaction of phenol with benzaldehyde was prepared in the presence of sulfuric acid as catalyst. Bisphenol novolacs were synthesized in both melting and solution processes using p-formaldehyde and formalin solution in the presence of oxalic acid catalyst. 1H NMR analysis shows a high methylene bridge contents using the novolacs synthesized in a melting process. The bisphenol novolac epoxy resin was prepared by reaction with epichlorohydrine in the presence of sodium hydroxide as a catalyst. The prepared novolac epoxy resins were cured with 1,2-amino ethyl piperazine (AEP) as a curing agent. The cured resins were evaluated as organic coating for steel. The mechanical properties of the cured epoxy resins were evaluated by measuring both impact resistance and hardness. The chemical resistances of the cured resins were evaluated through salt spray resistance, hot water immersion, solvent resistance, acid and alkali resistance measurements. The data indicate that the cured epoxy resins have excellent chemical resistances as organic coatings among other cured resins. |
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| Keywords: | Bisphenol Coating Curing Polyamine Marine coating Mechanical properties Corrosion |
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